Is it possible to put several objects together inside a union?

Question

What if I have this:

union{
    vector intVec ;
    vector floatVec ;
    vector doubleVec ;
} ;

Of cours

Answer 1

You cannot have unions containing non-POD class types. Your sample will not compile.

You can use boost::variant as a safe alternative to C unions. See the documentation on boost.org. You might, however, reconsider your design and use polymorphism instead. Depends on what you're trying to accomplish, of course.